Type head driving means employing flexible belt



TYPE HEAD DRIVING MEANS EMPLOY ING FLEXIBLE BELT Filed Aug. 30, 1967 H.DECKER Jan. 7, 1969 Sheet INVENTOR H A 8r) 4;

ATTORNEY Jan. 7, 1969 H. DECKER 3,420,350

TYPE HEAD DRIVING MEANS EMPLOYING FLEXIBLE BELT Filed Aug. 30, 1967Sheet .3 of 4 I ZI. I 2 2 2/ 42 22 2 a ATTORNEY Jan. 7, 1969 TYPE HEADDRIVING MEANS EMPLOYING FLEXIBLE BELT DECKER Sheet Filed Aug. 30, 1967 7INVENTOR f AW/ 4144a! Jan. 7, 1969 H. DECKER 3,420,350

TYPE HEAD DRIVING MEANS EMPLOYING FLEXIBLE BELT Filed Aug. 30, 1967Sheet 4 of 4 Fla. 7

INVENTOR Merl er) 4M0 M 64 our l ATTORNEY United States Patent US. Cl.197-16 Int. c1. B41j 1/32 20 Claims ABSTRACT OF THE DISCLOSURE The typehead of a business machine is mounted for angular movement about firstand second axis intersecting at right angles, and is rotated about thefirst axis by pulley and belt means so that angular displacement of thetype head about the second axis, and a printing movement about a thirdaxis can be carried out while the belt means is slightly flexed wherebyno universal joints are required.

Background of the invention The present invention relates to an improveddriving arrangement of a part-spherical type head which cooperates withthe paper carrier of a business machine, such as a typewriter for makingimprints of characters represented by several circular rows of typefaces on the type head. The type head is rotated about a first axispassing through the centers of the circular rows of type faces, andangularly displaced about a second axis to place a selected circular rowof type faces opposite the paper carrier. When the selected type face ofa selected circular row is located opposite the type carrier, the typehead is turned about a third axis to a printing position.

Description of the prior art In the type head driving arrangementdisclosed in the US. Patent 3,247,941, a tiltable frame is arrangedparallel to the platen and supports a hollow shaft for turning movementin which a rod is guided carrying at one end a cylindrical type head.The transmission means by which the turning motion is transmitted to thetype head, and which also serve for moving the cylindrical type head upand down, are mounted on the frame and constitute substantial masseswhich have to be accelerated so that the typing speed is reduced.

The construction disclosed in the German Patent 1,198,834 uses a hollowsperical type head which has circular rows of type faces requiring anangular displacement of the type head for the selection of a row of typefaces. Such angular movement is necessary in addition to the rotarymovement which causes a difliculty inasmuch as due to the angulardisplacement, the provision of a double universal joint is required.Since the play between the several parts of the transmission means andup even if tolerance limits are observed, the precision required for aperfect appearance of a line of imprints cannot be obtained.Consequently, two arresting devices are provided for arresting the typehead in an angular position in which a selected circular row of typefaces is located opposite the paper carrier, and for arresting the typehead when the selected type face of the respective row is locatedopposite the paper carrier. The great number of parts requires very highprecision during assembly, and great resistance to wear, and moreover,it is difficult to arrange all the required parts within the hollow typehead.

The US. Patent 2,902,132 discloses a similar spherical type head whichis rotated by a vertical drive shaft. In order to permit an angulardisplacement, the type head is mounted in a frame which is tiltableabout an axis which is parallel to a platen and perpendicular to thedrive shaft. The construction is complicated, and a great number ofparts is required which have complicated shapes requiring greatprecision during manufacture. The masses which have to move during theprinting movement are great, and the typing speed is limited.

The French Patent 1,411,426 discloses a barrel-shaped type head in whicha great number of parts are mounted for operating the type head asexplained above. Great masses have to be accelerated during eachprinting operation, and the typing speed is limited.

The US. Patent 2,879,876 discloses a type head controlled by selectingcams, and complicated transmission means having a substantial mass.

Summary of the invention It is the object of the invention to improvethe constructions of the prior art, and to provide a type head drivingarrangement of simple construction, having only few parts of low mass,and being capable of producing accurate imprints at a high typing speed.

Another object of the invention is to provide a type head drivingarrangement producing accurate spacing and positioning of the imprintsproduced by the type face so that the appearance of the typed lines isunobjectionable.

Another object of the invention is to provide an arrangement in which atype head can be easily exchanged for another type head having typefaces according to a different font so that the same typewriter can beused for typing different alphabets, languages, or scientific symbols.

Another object of the invention is to provide flexible drive means forrotating the type head so that the angular displacement of the type headcauses only slight twisting or bending of the flexible drive means andrequires no universal joints.

One embodiment of the invention comprises a type head located oppositethe paper carrier or platen of a business machine, such as a typewriter,and having a plurality of circular rows of type faces, carrier meanssupporting the type head for rotation about a first axis passing throughthe centers of the circular rows, supporting means supporting thecarrier means for angular movement about a second axis intersecting withthe first axis, selector means including an actuating means forangularly displacing the carrier means about the second axis for placinga selected row of type faces opposite the paper carrier, and drive meansincluding pulley means connected to the type head for movement with thesame about said first and second axis, and driven flexible means, suchas an endless belt, in driving connection with the pulley means forrotating type head about the first axis. During the angular displacementof the type head with the pulley means for the selection of a row oftype faces, the flexible means are slightly twisted or bent which has nodetrimental influence on the operation.

During rotation of the type head about the first axis, the type faces ofthe selected row successively pass the paper carrier, and arrestingmeans are provided for precisely arresting the type head in a positionin which the selected type face of the selected row of type faces islocated opposite the paper carrier.

The terms pulley and flexible means are used in the present applicationto define any driving connection having a flexible rope, chain, belt orcord passing over a wheel or roller.

In the preferred embodiment of the invention, the carrier means includesa carrier shaft mounted for rotation about the second axis, and having apair of arms in which a type head shaft is mounted for rotation. Thetype head consists of two part spherical shells detachably secured tothe type head shaft and rotating with the same. A

pulley is secured to the type head shaft and engaged at one side of itsperiphery by an endless belt which passes through the gap between therims of the two type head shells. When the carrier shaft is turned, thetype head shells assume angular positions in which different circularrows of type faces are located opposite the paper carriage and platen.

In another embodiment of the invention, the type head has a depressedannular portion serving as pulley about which a drive belt passes. Thedepressed annular portion is advantageously provided with teethcooperating with an arresting means for locking rotation of the typehead, and the arresting means are disposed on the side of the toothedarresting and pulley portion which is not covered by the drive belt.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawing.

Brief description of the drawing FIG. 1 is a fragmentary verticalsectional view illustrating one embodiment of the invention;

FIG. 2 is a fragmentary plan view illustrating the embodiment of FIG. 1and showing an angularly displaced position of the type head;

FIG. 3 is a fragmentary front view, partially in a vertical axialsection, and illustrating a second embodiment of the invention;

FIG. 4 is a fragmentary side view of the embodiment of FIG. 3, partiallyin section on line IVIV in FIG. 3;

FIG. 5 is a fragmentary sectional view taken in the direction of thearrow V in FIG. 3;

FIG. 6 is a fragmentary side view, partially in section along line IVIVin FIG. 3, and illustrating the driving arrangement of the embodiment ofFIGS. 1 to 5;

FIG. 7 is a fragmentary front view, partially in vertical section,illustrating the driving arrangement of FIG. 6; and

FIG. 8 is a fragmentary elevation partially in section, and illustratinga third embodiment of the invention.

Description of the preferred embodiments All embodiments of theinvention can be either used in business machines in which the papercarrier moves stepwise past the type head, or in business machines inwhich the type head is stepwise moved along the paper carrier.

Referring first to the embodiment of FIGS. 3 to 7, the supporting meansof the type head includes a tubular bearing means 37 with a bearing 36in which a hollow carrier shaft 35 is mounted for turning movement abouta vertical axis. Carrier shaft 35 has a pair of arms 32 with bearingbores 33 in which a type head shaft 24 is mounted for rotation. Typehead shaft 24 has a pair of threaded end portions on which nuts 23 aremounted which press two type head shells 19 against shoulders 25 so thatthe type head shells 19, 20 can be easily detached and replaced by othertype head shells which have different type faces arranged in circularrows 21 and 22.

The axis of type head shaft 24 and of type head 19, 20 passes throughthe centers of the circular rows of type faces 21, 22 and intersects theaxis of carrier shaft 35 at right angles.

As shown in FIG. 7, carrier shaft 35 has a lower end mounted for turningmovement in a bearing 36 at the lower end of the tubular bearing means37, and is connected to an actuating member 52, which is operated in amanner which is not an object of the invention by means substantially asdescribed in the U.S. Patent 2,879,876 to turn carrier means 35, 32, 24,23 about a vertical axis between four positions, in each of which onecircular row of type faces 21 or 22 is located opposite the platen.

FIG. 2, which illustrates another embodiment of the invention, shows inbroken lines a normal position of a type head 1 in which one of thecircular rows of type faces 2 is located opposite the platen, and insolid lines an angularly displaced position of the type head 1 in whichthe outermost circular row of type faces cooperates with the platen.

As best seen in FIG. 5, the inner surface of each of the type headshells 19, 20 has two pairs of coupling portions 26 between whichtransverse coupling pins 27, which pass through type head shaft 24, arelocated. Due to this coupling connection, the angular position of thetype head shells and of the type faces of the same, in relation to theaxis of shaft 24, is exactly determined, and it is in this angularposition that nuts 23 are tightened.

The circular rims 42 of the type head shells 19 and 20 are spaced fromeach other to form an annular gap. A pulley 28 having peripheral teeth31 is surrounded by the gap so that an endless flexible belt 31 can beinserted through the gap and placed on the teeth 30 of pulley 28, whilethe other end of the endless loop of the flexible belt 31 is placedabout another pulley 55 whose central bore has inner projections coupledwith axially extending grooves in a drive shaft 56 so that drive pulley55 remains coupled to drive shaft 56 for rotation, while being moved inaxial direction.

When drive shaft 56 is driven by a motor, not shown, drive pulley 55drives pulley 28 through belt 31 whose inner teeth mesh with teeth 30 ofpulley 28.

A worm screw 29 in a threaded bore of pulley 28 secures the same fixedlyto type head shaft 24 so that the same is rotated and transmits therotary movement through coupling means 26, 27 and nuts 23 to the twotype head shells 19 and 20 which rotate about a first axis defined bytype head shaft 24 and bearings 33 so that the type faces of the fourannular rows 21, 22 successively pass the printing area.

Toothed arresting wheels 40 are formed within type head shells 19 and20, the teeth and notches between the same being respectively associatedwith the type faces of the circular rows 21 and 22 which are arranged incolumns located in radial planes passing through the axis of shaft 24.

Arresting means are provided for arresting the type head shells andinclude the rod 38 mounted for axial movement in the hollow carriershaft 35, and a transverse arresting pin 39 guided in slots 41 of arms32 which are part of the carrier means of the type head.

When rod 38 is shifted in axial direction by means substantially asdescribed in the U.S. Patent 2,879,876 for the selection of a type face,the two ends of pin 39 respectively engage notches of the arrestingwheels 40 and stop the two type head shells 19 and 20 in angularpositions in which a column of type faces including the selected typeface and character, is located opposite the platen.

Pulley 55 is always located in a plane perpendicular to shaft 56 and tothe axis of platen 57. However, since type head 19, 20 is angularlydisplaced about the second axis defined by tubular bearing member 37 andcarrier shaft 35, pulley 28 is located in a plane slanted to the planeof pulley 55 when the type head is turned to a position in which one ofthe outer circular rows of type faces is operative.

In order to prevent a transverse displacement of a flexible belt 31 onone of the pulleys, fork-shaped guide means 44, 43 are fixedly securedto carrier shaft 36, located in a plane perpendicular to shaft 24 andpositioned for holding the flexible belt 31 parallel to the circularrims 42 of the type head shells 19, 20 so that rims 42 cannot be engagedby the moving flexible belt when the type head is angularly displacedabout the axis of carrier shaft 35.

The tubular supporting and bearing member 37 has a forked lower endportion, best seen in FIG. 7. The arms 46 have bearing bores receivingjournals 45 secured to the arms of a stationary bracket member 51 sothat tubular bearing member 37 is turnable about the third axis definedby journals 45 between a position in which the type head is spaced fromthe platen, and a printing position in which a type face of the typehead produces an imprint. One arm 46 is extended at 47 and carries ajournal 48 on which a cam follower roller 49 is mounted for cooperationwith a cam 50. When the cam lobe of cam 50 engages follower roller 49,supporting means 47, 46, 37, 36 is angularly displaced about the axis ofjournals 45 to place the type head in the printing position shown inFIG. 6. When a lower portion of cam 50 is located opposite followerroller 49, a spring 58 secured to the tubular member 37 moves the sameand thereby the type head away from platen 57.

From the above description of the embodiment of FIGS. 3 to 7 it isapparent that drive means 56, 55, 31, 29, 28 rotate type head shaft 24with type head shells 19, 20 about a first axis defined by shaft 24 andbearing bores 33 while type faces of the circular rows of type faces 21and 22 pass the printing area. When the selection of a character andtype face is desired, an actuating means 52 controlled from the keys ofthe machine, not shown, and secured by nut means 53 to carrier shaft 35,turns the carrier means 35, 32 about the second axis defined by carriershaft 35 and tubular supporting and bearing member 37 until the circularrow of type faces containing the selected character is located oppositethe paper carrying platen.

Thereupon, arresting means 35 is operated when the selected type face islocated opposite the printing area, so that arresting pins 39 engagenotches between the teeth 40 of the arresting wheels and stop the latterin the desired position in which the selected character of the selectedrow of type faces is located opposite the platen.

When carrier means 35, 32 is turned, guide means 43, 44 thereon turn thebelt portion which passes over pulley 28 relative to pulley 55 so thatthe edges of belt 31 cannot engage rims 42 of the type head shells. Thebelt portions respectively embracing pulleys 28 and 55 are slightlytwisted relative to one another when the type head and the belt guidemeans 43, 44- are angularly displaced. Cam 50 turns supporting [means47, 46, 37, with carrier means 35, 32, type head shaft 24 and type head19, 20 about a third axis defined by journals 45 to a printing position.

The embodiment illustrated in FIGS. 1 and 2 is operated as describedwith reference to FIGS. 6 and 7. However, the type head construction issimplified.

An integral type head 1 has a part spherical surface having fourcircular rows of type faces 2. A recessed annular portion in the planeof symmetry of type head 1 has peripheral arresting teeth 4 and forms arecess 3 in the surface of the type head. A type head shaft 5 is locatedin bores 8, and fixedly secured to a pair of carrier arms 9 whichproject from a carrier shaft 11 mounted by means of bearings 12 forturning movement about a vertical axis in the tubular bearing andsupporting member 13. Carrier shaft 11 corresponds to carrier shaft 35,and tubular bearing and supporting member 13 corresponds to member 37 ofthe embodiment of FIGS. 3 to 7, and is operated as described withreference to FIGS. 6 and 7. Carrier shaft 11 is hollow and guides anarresting means 14 for axial movement between an inoperative retractedposition, and an advanced position shown in FIG. 1 in which its endportion 15 projects into a notch between two adjacent arresting teeth ofthe recessed annular portion of the type head for arresting the same inan angular position in relation to the axis defined by type head shaft 5on which type head 1 is mounted for rotation by means of bearings 6.

The arresting wheel constituted by teeth 4 in groove 3 also serves asthe pulley by which the type head is driven,

corresponding to the function of pulley 28 in the embodiment of FIGS. 3to 7. An endless flexible belt 18 passes over the upper half of thetoothed recessed annular portion, and over another pulley which isarranged as described with reference to FIGS. 6 and 7. Since the lowerportion of the toothed annular portion is not covered by the loop of theendless belt, arresting means 14 can cooperate with teeth 4.Consequently, the recessed annular portion in recess 3 performs both thefunctions of a pulley and of an arresting wheel.

The vertical axis 16 defined by carrier shaft 11 intersects thehorizontal axis of the type head shaft 5 at right angles. The normalposition of the type head is illustrated in broken lines in FIG. 5, andit will be understood that the type head can be angularly displacedabout axis 16 to the position shown in solid lines in which one of theouter circular rows of type faces 2 cooperates with the platen 17. It isapparent from FIG. 2 that in this position, the portion of belt 18engaging the recessed annular groove of the type head is twisted sincethe other end of the endless flexible belt is maintained in initialposition by the other pulley, not shown, which corresponds to pulley 55described with reference to FIGS. 6 and 7.

The tubular member 13 is mounted for turning movement about a thirdaxis, corresponding to journals 45, and is operated to move the typehead toward and away from the platen 17 by cam means described withreference to FIGS. 6 and 7.

Another embodiment of the invention is illustrated in FIG. 8. Asubstantially bell-shaped type head 60 has three circular rows 61, 62,63 of character type faces and has a closed end formed with a bearingportion mounted on type head shaft 64 for rotation about a first axis,and is detachably held on type head shaft 64 by a nut means 64a whichabuts a shoulder on type head shaft 64. Type head shaft 64 is secured toa bridge member 65 having two arms mounted for turning movement about asecond axis defined by carrier journals 66 which are secured tosupporting arms of a supporting bracket 67 whose hub 77 is mounted on ashaft 76.

One arm of member 65 is extended at 68 and carries a gear segment 69meshing with a gear 70 on a shaft 71 turnably mounted in a bearing 72secured to bracket 67. Gear 70 is an actuating means for turning carriermeans 68, 65, 64 about the axis defined by journal 66 between angularpositions in which different circular rows of type faces 61, 62, 63 arelocated opposite the platen 57.

The bell-shaped type head 60 has an open end into which the supportingarms of bracket 67 project.

Adjacent the open end, a recessed annular portion and groove 73 which isprovided with teeth and constitutes a pulley one side of which isengaged by a portion of an endless flexible belt 74 which also passesabout another pulley 75 whose shaft 76 is mounted for rotation inbearings 77 and 78 of supporting bracket means 67.

When drive shaft 76 is driven, pulley 75 drives flexible belt 74 andthereby the type head 60 which rotates about the axis defined by shaft64. Actuating gear 70 turns the type head about the carrier axis definedby journal 66 to a position in which the circular row of type facescontaining the selected character is located in an operative positionopposite the platen, and rotation of the type head 60 is stopped at theproper moment by an arresting means, not shown, engaging the teeth ofthe recessed annular portion 73, as described with reference to FIG. 1.The type head is operated to produce the imprint of the selectedcharacter.

In a position of the type head 60 displaced about the axis of journals66, belt 74 is slightly twisted.

Summarizing, in all embodiments of the invention, three motions of thetype head can be carried out.

(1) The type head 1, or 19, 20, or 60 is rotated about a first axis 5,24, 64 so that the type faces of the circular rows successively pass thepaper carrier 17, 57.

(2) The type head is angularly displaced about a second axis 11, 35, 66intersecting the first axis at right angles and passing through theplane of the belt and pulley. Actuating means 52, 70 of selector meansperform this function by which one selected circular row of type facesis placed in an operative position. An arresting means 14, 39 engages acorresponding arresting wheel secured to the type head for stoppingrotation of the same in a position in which the selected type face ofthe selected circular row of type faces is located opposite the platen.

(3) Supporting means 37, 46 is turned about a third axis 45 for movingthe type head to the printing position.

Additionally the type head is moved along the platen while pulley 55moves in axial direction on drive shaft 56 but remaining coupled withthe same for rotation, or the paper carriage is moved relative to thetype head, as is known to those skilled in the art.

From the above description, it becomes apparent that the presentinvention provides very simple apparatus for obtaining the threenecessary motions of the type head. All parts which move with the typehead are small and light, so that the accelerated mass is small, and ahigh typing speed can be achieved. The apparatus permits a precisepositioning of each type face so that a perfect appearance of a printedline is assured.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types oftype head arrangetlllBIllS differing from. the types described above.

While the invention has been illustrated and described as embodied in atype head driving arrangement including a pulley and belt means forrotating the type head about a main axis and permitting angulardisplacement of the type head about a second axis, it is not intended tobe limited to the details shown, since various modifications andstructural changes may be made without departing in any way from thespirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

I claim:

1. Type head driving arrangement for use in a business machine having apaper carrier, comprising, in combination, a type head located oppositesaid paper carrier and having a plurality of circular rows of typefaces; carrier means supporting said type head for rotation about afirst axis passing through the centers of said circular rows; supportingmeans supporting said carrier means for angular movement about a secondaxis intersecting with said first axis; selector means including anactuating means for angularly displacing said carrier means about saidsecond axis for placing a selected row of type faces opposite said papercarrier; and drive means including driven pulley means connected to saidtype head for movement with the same about said first and second axes,drive pulley means mounted for rotation about a stationary axis, anddriven flexible means in driving connection with said drive pulley meansand driven pulley means for rotating said type head about said firstaxis so that the type faces of the selected row successively pass saidpaper carrier, said flexible means being twisted when said carrier meansand driven pulley means are angularly displaced about said second axisrelative to said drive pulley means.

2. Type head driving arrangement as claimed in claim 1 wherein saiddrive means include a drive shaft parallel to said first axis, andwherein said drive pulley means is mounted on said drive shaft for axialmovement and is connected to the same for rotation.

3. Type head driving arrangement as claimed in claim 1 wherein saiddriven pulley means is located in a plane passing through said secondaxis perpendicularly to said first axis and has a normal position inwhich said drive pulley means is located in said plane, said drivenpulley means having at least one position angularly displaced relativeto said drive pulley means about said second axis in which position aselected row of type faces is placed opposite said paper carrier so thatsaid flexible means is twisted.

4. Type head driving arrangement as claimed in claim 1 wherein saidcarrier means includes carrier shaft means mounted on said supportingmeans for angular movement about said second axis and being connectedwith said actuating means; wherein said driven pulley means is securedto said type head and located in a plane passing through said secondaxis perpendicular to said first axis, wherein said flexible means forman endless loop having a loop portion in engagement with said pulleymeans; and comprising guide means for said endless loop secured to saidcarrier shaft means and engaging said loop portion for angularlydisplacing said loop portion with said driven pulley means when saidcarrier shaft means is turned about said second axis with said type headand pulley means so that said loop portion remains in said plane of saiddriven pulley means while said driven pulley means turns relative tosaid drive pulley means.

5. Type head driving arrangement as claimed in claim 1 wherein saiddriven pulley means is provided at one end of said type head on one sideof said rows of type faces; wherein said one end of said type head isopen; wherein said carrier means include a carrier shaft supporting theother end of said type head for rotation, about said first axis, andhaving two arms located in said type head; and wherein said supportingmeans include a pair of arms projecting into said open end andsupporting said arms and thereby said carrier means and type head forangular movement about said second axis.

6. Type head arrangement as claimed in claim 1 wherein said drivenpulley means is located in a plane passing through said second axisperpendicularly to said first axis; and wherein said first and secondaxes extend at right angles to each other.

7. Type head driving arrangement as claimed in claim 1 wherein saiddriven pulley means is secured to said type head for rotation about saidfirst axis; comprising an arresting wheel having peripheral teeth andsecured to said type head for rotation about said first axis; andwherein said selector means include arresting means mounted on saidcarrier means for movement to and from an arresting position engaging atooth of said arresting means and blocking rotation of the same; andwherein said flexible means engage one side of said driven pulley meansand leave the other side of the same free, said arresting means engagingsaid other side.

8. Type head driven arrangement as claimed in claim 1 and compisingmeans mounting said supporting means for angular movement with saidcarrier means and said type head toward and away from said paper carrierabout a third axis parallel to said first axis.

9. Type head driving arrangement as claimed in claim 1 wherein saiddriven pulley means is an annular groove in said type head located onone side of said plurality of annular rows of type faces.

10. Type head driving arrangement as claimed in claim 1 wherein saiddriven pulley means is located in a plane of symmetry of said type headpassing through said second axis at right angles to said first axis.

11. Type head driving arrangement as claimed in claim wherein saiddriven pulley means is an annular groove in said type head locatedbetween two rows of type faces.

12. Type head driving arrangement as claimed in claim 1 wherein saidcarrier means includes carrier shaft means mounted on said supportingmeans for angular movement about said second axis and connected withsaid actuating means, and a type head shaft means mounted on saidcarrier means for rotation about said first axis and being secured tosaid type head for movement therewith; and wherein said driven pulleymeans is secured to said type head shaft means.

13. Type head driving arrangement as claimed in claim 12 wherein saidtype head includes a pair of type head shells secured to said type headshaft means spaced from each other and having annular rims forming anannular gap having a greater diameter than said driven pulley means andsurrounding the same; and wherein said flexible means passes throughsaid gap and partly around said driven pulley means, and is narrowerthan said gap.

14. Type head driving arrangement as claimed in claim 13, wherein saidcarrier shaft means includes a carrier shaft having a fork shapedportion with two arms having bearings; wherein said type head shaftmeans includes a type head shaft mounted in said bearings and radialcoupling pins projecting from the ends of said type head shaft; andwherein said type head shells have coupling portions on the innersurfaces thereof located on opposite sides of said coupling pins forcoupling said shells with said type head shaft.

15. Type head driving arrangement as claimed in claim 14 wherein saidtype head shaft has threaded end portions projecting through bores insaid shells and having shoulders within said shells; and wherein saidcarrier means include nuts on said threaded end portions pressing saidshells against said shoulders for detachably securing said shells tosaid type head shaft in angular positions determined by said couplingpins.

16. Type head driving arrangement as claimed in claim 13 wherein saidsupporting means includes a tubular bearing means supporting saidcarrier shaft means for rotation; comprising means for mounting saidtubular bearing means for angular movement about a third axis parallelwith said first axis for moving said type head toward and away from saidpaper carrier; and means for tilting said tubular bearing means withsaid carrier means and said type head about said third axis.

17. Type head driving arrangement as claimed in claim 16 wherein saidcarrier shaft means includes a hollow shaft; wherein each type headshell has an inner toothed arresting wheel; and wherein said selectormeans include an arresting means mounted in said hollow carrier shaftfor axial movement between a normal position and an arresting position,and including an arresting member engaging in said arresting positionteeth of said arresting wheels for arresting the same for holding aselected type face of a selected row of type faces opposite said papercarrier.

18. Type head driving arrangement as claimed in claim 17 wherein saidflexible means is an endless belt having a portion in engagement withone side of said driven pulley means; wherein said arresting means andsaid hollow shaft are located opposite the other side of said pulleymeans within said endless belt; said driven pulley means and said beltbeing located in a plane passing through said second axis perpendicularto said first axis, said belt being twisted. when said driven pulleymeans is turned with said type head about said second axis.

19. Type head arrangement as claimed in claim 1 including teeth securedto said type head for rotation about said first axis; and wherein saidselector means include arresting means mounted on said carrier means formovement to and from an arresting position engaging a tooth of said typehead and blocking rotation of the same in an angular position in which aselected type face of said selected row of type faces is locatedopposite said paper carrier.

20. Type head driving arrangement as claimed in claim 19 wherein saiddriven pulley means is an annular recessed portion of said type headhaving teeth and constituting also said arresting wheel; and whereinsaid flexible means forms and endless loop engaging one side of saidannular recessed portion and leaving the other side free; and whreinsaid arresting means is located on said other side for cooperating withthe teeth of said annular recessed portion.

References Cited UNITED STATES PATENTS 2,905,302 9/1959 Hickerson 197523,221,863 12/1965 Pietzsch 19755 X 3,247,941 4/1966 Beattie et al. 197553,343,642 9/1967 Weidanz et al. 19755 X WILLIAM B. PENN, PrimaryExaminer.

EDGAR S. BURR, Assistant Examiner.

US. Cl. X.R. 19752,

